Pulverizing mill



Apr. 10, 1923. 1,451,472:

R. E. H. POMEROY PULVERIZING MILL Filed June 1, 1921 2 Sheets-sheet 1 51 10014- toz' I v 62. pmmm;

3&1? abhor Wat Apr. 10, 1923.

R. E, H. POMEROY PULVERIZING MILL F1. led June 1, 1921 2 sheetssheet 2 I Patented Apr, 10, 1923. ii r UNHTED STATE 11,451,412; PATENT oFF cE.

, RALPH E. H. POMER-OY, OF CANTON, OHIO.

PULYVERIZING MILL;

Application filed June 1,

To all whom it may concewi: Be it known that I, RALPH E. H. POM- EROY, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented a certain new and useful Improvement in Pulverizing Mills, of which improvement the following is a specification.

This invention relates to pulverizing mills of the rotary type in which the material to be ground is introduced into a rotatable shell containing a mass of loose tumbling devices,

such as balls, pebbles, blocks, rods, or bars ofiron, steel-, ,or other hard material, and adapted to be tumbled about during the rotary movement of the shell'to effect the grinding action upon the material to be pulverized.

In my prior application, filed June 30, 1920, Serial No. 393,147, there is shown and described a pulverizing apparatus of this type, inwhich a current of air is conducted inward through perforations in the periphcry of the rotatable shell, and out at one of the hollow trunnions for carrying off the finer particles of the material asthe same becomes pulverized, the air being intro-- duced through a stationary casing surround-[ ing the rotatable shell and having partitions for directing the air through that portion of the shell usually occupied by the tum-,-

bling mass during the operation of the mill.

According to one of the features of my present improvement, means are provided for adjusting or varying at will the portion or area of the periphery of the rotatable shell at which the air may be introduced, and this, preferably, comprises a. movable air chamber or casing adjustably mounted at the outside of the shell and communicating with a portion of the perforations therein.

Another feature of my present improve ment relates to the lininggfor'the rotatable shell, and comprises improved liners formed in longitudinalsections, each containing an air chamber or chambers communicating with the perforations in the shell andhaving aseries of air ports discharging through a face of the liner into the pulverizing chamber of themill.

In the accompanying'drawings: Figure 1 is a view, partly in elevat on, but mainly in vertical longitudinalsection, of a pulverizing mill embodying my improvement F ig.

2, a transverse section ofthe same; Fig. 3,

an end elevation; Fig. 4, a sectional view of 1921. Serial No. 474,079.

the adjusting mechanism for the air chamher; and, Fig. 5, a view, partlyin end elevation and'partlyin section, of a liner.

According to the preferred construction shown in the drawings,'the improved pulverizing mill comprises the rotatable shell, 5,

preferably cylindrical, and connected to suitable heads, 6, having hollow trunnions, 7,

rotatably mountedin fixed bearings, 8, supported upon suitable bases." .Various means may be employed for rotating the shell, such as a driving gear, 9, attached to oneof the heads, 6, and engaging a gear, 9, on a power The interior surface of the shell is covered witha lining, preferably composed of a jseries of longitudinal sectionsor liners, '15, of

substantially the full lengthof the she I, and each having one 'or, more air chambers, 16, and ports, 18, leading I p therefrom through an inclined face of ay metal, extendin raised portion of the liner extending above the base ofthe adjoining section. The base portions of the liners are formed with radial surfacesso as to fit together in the form-;,,

of a y d al arch within'the shell, and;

may be keyed together by metal retaining.

strips, 20, located in adjoining grooves formed in the engaging faces of adjacent linersp Slots, 17, are formed in the shell to supply air to the chambers, '16, the liners, I 1'5. End liningplates, 19, may also'be fitted to interlock with the ends of the side liners-,1

15, for protectingfthe heads, 6, o ffthe mill. For the purpose of supplying a current of air through aportion of the slots. .17, of

the shell, and for adjusting theplace at which-the air is introducedyI provide an ada j ustable air chamber, 14, outside of the shell,

5, and this chamber may be formed of a casing, 12, surrounding the shell and rotatably supported independently thereof upon the wheels or, rollers, 13. A portion of the casing, 12, is formed to fit upon the outside of the 'shell, 5,with only sufiicient clearance to permit ofthe free movement of beneath the mill.

the rotary shell, while the remainder of casing, 12, preferably about one-half of the cylinder, is made of larger diameter to form ing, 12, and adapted to be supported by and roll upon the pairs of wheels or rollers, 13, mounted in a frame, 24, which may be adjustably supported upon a suitable base, 26,

rotary shell, b,a1e provided with interlocking or overlapping circular flanges, 21 and 22, respectively, at the opposite ends of the cylinder to serve as an air seal and prevent an excessive leakage of air between the shell and the casing. Airis introduced into the chamber, 14, through the inlet opening, 25, and the air current may be created in any desirable manner, either by a blower discharging into the inlet opening, or by a suction fan (not shown) connected to the outlet through the hollow trunnion, 7, oppositethe feeding mechanism.

For thepurpose 'of adjusting the position of the air chamber, 14, circumferentially upon the rotary shell, I'have shown a segmental rack, 27 attached to the casing, 12, and meshing with a pinion, 28, on shaft, 29, having a manually operated crank, 30. The

position by the latch, 32, engaging the notched wheel,'31, fixed on the shaft, 29.

- When the mill is in operation with the shell partly filled with the material-to be pulverized, and the loose grinding devices, 11,

the tumbling mass assumes a position at the lower right hand segmental portion of the shell, as indicated in Fig.2,- and in order that the current of air may be introduced through the peripheral slots, 17, throughout that portion of rotating shell, the casing, 12, is usually adjusted to bring thechamber, 14, to this position, as shown in Fig. 2 of the drawings. 'The current of air ,then passes inward from chamber, 1 1, through the slots, 17, in that portion of the rotating shell occupied-b the tumbling mass, through the mass itse f and out at the hollow trunnion,

7, carrying with it the fine pulverized material which is then collected by suitable separators in the usual way.

If, owing to different conditions of the material or to speed of operation, it be desired to shiftthe point at which the air current enters the periphery of the shell, or to vary the admission of air, the outer'casing, '12, may be readily adjusted by means of the crank, 30, to shift the position of the air The casing, 12, and the chamber, 14, circumferentially upon the shell so as to direct the air supply to any desired portion of the shell. I

By means of this adjustable feature, the amount of air supplied through the. tumbling mass may be regulated, and the portion of the shell at which the air current is introduced may be shifted to suit different conditions, and produce the most efficient operation of the .mill.

The improved construction of liners in which the base portions are formed with radial surfaces adapted to fit together as a true cylindrical-arch greatly strengthens the'lining of the mill and results in more durable and efiicient operation.

Having now described my Letters Patent is:

1. In a pulverizing apparatus, the combi nation of a rotatable shell having perforations in its periphery and having therein loose tumbling devices for fLSSlSlLlIl in grinding the material, means for supplying a currentof air inward through said perforations, and adjustable means for shifting said air supply relative to the shell so as to be admitted to different portions of the shell i 2. In a pulverizing apparatus, the combination of a rotatable shell having perforations in its periphery and having therein loose tumbling devices for assisting in grinding the material, an air supply chamber on the outside of said shell, and means for moving said chamber to different posicasing may then be locked in any desired tions upon the shell.

3. In a pulverizing apparatus, the combination of a rotatable shell having'perforations in its periphery andhaving therein loose tumbling devices for assisting in grinding the material, an air supply chamber on the outside of the shell, and adjusting means for shifting said chamber circumferentially upon the shell.

1. In a pulverizing apparatus, the combination of a rotatable shell having perforations in its periphery and adapted to contain loose tumblingdevice for assisting in grinding the material, an air supply chamber covering the exterior of a segmental portion of the shell, and means'for moving said chamber circumferentially upon the shell.

5. In a pulverizing apparatus, the combination of a-substantia'lly horizontal rotatable cylindrical shell having perforations in its periphery, an air supply chamber adjustably mounted on the outside of said shell, and means for shifting the position of said alilrfihamber circumferentially relative tothe s e 6. In a pulverizing apparatus, the combi nation of a rotatable cylindrical shell having perforations in its periphery, a casing surrounding the shell and having an air invention, what I claim as new and desire to secure by said chamber for supplying a current of air to said perforations, and-means for shifting air supply to difierent portions of the shell.

7. In a pulverizing apparatus the combination of a rotatable cylindrica shell having perforations in its periphery, a casing surrounding the shell and rotatably supported, said casing having an air supply chamber communicating with a portion of said perforations, and means for shifting said 'casing circumferentially relative to said shell.

8. In a pulverizing apparatus, the combination of a rotatable cylindrical shell hay-i ing perforations in its periphery, a casing surrounding said shell, and rotatably sup;

orted independently thereof, said casing aving an air supply chamber communicating with a portion ofsaid perforations, and means for shifting said casing relative to said shell. v

9. Inapulverizing apparatus, the combination of a rotatable cy indri'cal shell having perforations in its periphery, a casing surrounding said shell and having an air 7 supply chamber communicating with a portion of said perforations, rollers for rotatably supporting said casing independently of the shell, and means for adjusting the position of the casing upon the rollers.

v 10. In a pulverizing apparatus, the combination of a rotatable cylindrical shell having perforations in its periphery, a casing surrounding the shell and rotatably supported, said casing having an air supply chamber communicating with a portion of said perforations, and a rack and pinion for shifting the position of, said casing.

v 11. Ina pulverizing apparatus, the combination with a rotatable shell havin per .forations in its periphery, of hollow iners formed 1n longitudinal sections each comprising a base portion having radial surfaces adapted to fit together in a circular arch, anda ralsed portion between said radial surfaces, and having-an inclined longi-.-

tudinal face, said sections having air discharge ports extending through said incliched face.

- 12. In a pulverizing apparatus,the conibination with a rotatable shell having perforations in its periphery, of hollow liners formedin longitudinal sections each com- 

